One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,9,11)(7,12,8,10)(13,14,17,18)(15,19,16,20)(21,22,26,30)(23,27,33,35)(24,29,25,28)(31,34,32,36)(5,7,9,8)(6,10,11,12)(14,18)(19,20)(21,23,26,33)(22,27,30,35)(24,32,25,31)(28,34,29,36)(2,4)(5,8,9,7)(6,10,11,12)(13,15,17,16)(14,19,18,20)(22,28)(23,31)(24,25)(29,30)(32,33)(34,36)(13,16,17,15)(14,19,18,20)(21,24,26,25)(22,28,30,29)(23,32,33,31)(27,34,35,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.